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Are you perhaps not using an adblocker and thereby being trapped into wrongly believing that the slowness induced by ad+tracking Javascripts is the fault of Firefox?

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Let me give you another datapoint.

My old uni laptop, an Intel T4400 with 4gb RAM.

Both chrome and Firefox have adblock.

Never ran in to a problem with Chrome, despite the wider internet calling it a memory hog.

Firefox struggled after 4/5 tabs, couldn't even playback video on YouTube or Vimeo reliably..

Don't run into these issues on desktop, and the Android version seems somewhat competent. But I've lost a lot of trust in Mozilla the last few years thanks to middle management.

Atleast with Google I know their motives and I'm not locked in to their platform relying on any particular proprietary thing they have.

For what it’s worth and based on a non-trivial sample set this is highly atypical.

Yep. I rarely see Firefox lagging/unresponsive (~15 pinned + 3-4 normal tabs open). In the rare chances that it does, I get an option "This web page is slowing down Firefox" which lets me kill the tab and all is well again.

Poor video playback in one browser might mean that it's not configured to use the hardware decoder. I think performance there should be basically the same for video playback if they're configured the same way.

I am using an adblocker.

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